Drill-cutter mounting



Original Filed Aug. 22, 1927 l/ v Il H Patented July i 1, A1930 UNITEDSTATES PATENT OFFICE JOHN R. DALLERUP, OF-EOUSTON, TEXAS., ASSIGNOR TOREED ROLLER BIT COMPANY, OF HOUSTON, TEXAS, A CORPORATION OF TEXASDRILL-CUTTER MOUNTING Original application led August 22, 1927, SerialNo. 214,683. Divided and this application iiled January 14, 1928.LSerial No. 246,722.

This invention relates to drills, and more particularly to drill cuttermountings of the type disclosed in my application for Letters Patent` ofthe United States, filed August 22nd, 1927, Serial Number 214,683,

of which this is a division.

The invention has for one of its speciiic objects the provision of 'anadjustable cutter mounting whereby a cutter may be mounted in variouspositions in a drill head.

Various other objects will hereinafter apear.

j p The preferred embodiment of the invention is illustrated by theaccompanying drawing, inwhich Fig. 1 is a fragmentary side elevation ofa bit head; Fig.` 2 is a fragmentary detaill side View at right anglesto Fig. 1; Fig. 3 is a fragmentary side elevation illustrating themounting of'ya reamer in the side of a reamer body; andiFig. 4 is asection on the line 4 4 of Fig. 3.

Referring specifically to Figs. 1 and 2 of the drawings, the bit head isindicated at A, and has the usual cross roller cutter recess in thebottom thereof and depending bearing projections A. Said projectionssupport the ends of pin 3. Pin 3 has a sleeve or bushing 2 thereon, and.cutters 5 are revoluble on said bushing.'

This invention provides means whereby the axis of rotation of saidcutters may be adjusted so that said cutters will project the desireddistance below said head. l

The ends of pin 3 are substantially rectangular in cross section, andeach ofthe bearin openings in the depending projections is adapted toreceive one end of pin 3 and one of the gibs indicated by 1 and 1. Oneof these gibs may be made integral with pin 3.

`As shown, the parts are so disposed that the cutters will be held intheir lowermost position. To so adjustl the parts that the cutters willbe held in their uppermost position, it is necessary only to move thegibs 1 and 1 so that they will be under the ends of pin 3. The gib 1 andthe adjacent end of pin 3 are bored for the reception of retaining setscrew 4. The gib 1 and the other 50 end of the pin 3 may be detachablyconnected together by a peg 11, which is preferably driven through thegib 1 into the pin 3, as shown.

To increase the diameter of a well bore, it is now the custom to removethe original reaming cutters from the head, and to mount larger cuttersin the place thereof, the bit This, invention provides a mounting whichrenders unnecessary the use of cutters of more than one size, anembodiment thereof'being illustrated in Figs. 3 and 4 wherein the reamerbody as indicated at B has a rounded recess in which the reamer cutters8 are mounted.

.The pin having ends non-circular in cross section is indicated at 6,the gibs at 5, the retaining set Vscrew at 9, the bushing ,at 7, and thereamer cutters at 8.

vThe position in which the reamers are held is advantageous yfor variousreasons, of which the ability to cut a hole' of a great diameter may bementioned.- Should it become desirable to pass the'reamer assemblythrough a pipe casing of a comparatively small internal diameter thegibs may be placed on the outside of pin 6. It will be understood thatthe pin 6l is removable through. the opening 10.

It is not necessary that the intermediate portions of the pins 4 or 6 benoncircular in cross section.

I claim:

1. In a drill, a head having a bearing, a pin, a gib,`said pin and gibbeing supported in said bearing, and a cutter supported Joy said pin,said gib being movable to'vary the position of said cutter with respectto said head.

2. In a drill, a head having a bearing, a pin, said pin beingnon-circular in crosssection, and a gib, said pin and gib beingsupported in said bearing, and a cutter supported by said pin, said gibbeing movable to vary the position of said cutter with respect to saidhead.

3. In a drill, a head having a pair of bearings, a pin, the ends of saidpin being noncircular in cross-section, and a pair of gibs, each of saidbearings supporting one of the ends of said pin and one of said gibs,and a cutter supported by said pin, said gibs being movable to vary theposition of said cutter with respect to said head.

4. In a drill, a head having a pair of bearings, a pin and a pair ofgibs, each of said bearings supporting one end of said pin and one ofsaid gibs, and a cutter supported by said pin, said gibs being movableto vary the position of said cutter with respect to said head.

5. In a drill, a head having a recess and a bearing openingcommunicating With said recess, a pin, a gib, said pin and gib beingsupported in said bearing, and a cutter supported by Vsaid pin, said gibbeing movable to vary the position of said cutter With respect to saidhead.

6. In avdrill, a head having a recess and a bearing openingcommunicating With said recess, a pin, a gib, said pin having an endnon-circular in cross-section, said end and said gib being supported insaid bearing, and a cutter supported by said pin, said gib being movableto vary the position of said cutters with respect to said head.

7. In a drill, a reamer body having a recess in the side thereof, and abearing opening communicating with said recess, a pin,

a gib, said pin and gib being supported in,

said bearing' opening, and a reamer cutter supported by said pin, saidgib being movable to vary the positiomnr` said cutter vvithl respect tosaid body.

In Witness whereof, I hereunto aix my signature.

JOHN It. DALLERUP.

